High Speed Press Bottom Dead Center Repeat Precision Analysis And Control Research

With the development of high speed press and the development of high speed press, the dynamic performance of high speed press has been paid more and more attention. The important evaluation standard of dynamic performance is the bottom dead center repeatability positioning accuracy. Improving the bottom center precision is the problems of all the press industry. This graduation thesis setting out from practice, give a comprehensive analysis on the influence of each factor in the bottom center precision. And the analysis and experiment are carried on the influence of the bottom center precision important factor. Finally some improving measures and solutions are put forward. Laying a foundation for the bottom dead center repeated positioning accuracy increasing in theory and Practice.Firstly, on the basis of comprehensive analysis of the bottom dead center repeatability positioning accuracy, give the fuselage a static analysis through ANSYS finite element analysis software of Workbench. And the fuselage was optimized to enhance the stiffness and strength of the scheme. Give the fuselage a modal analysis to find out the multiple natural frequencies and vibration type. And use the signal analysis system and processing system on the spot test, verify the analysis accuracy, proposed the theory to avoid resonance. At the same time, in order to study the dynamic performance, also give the fuselage a transient analysis in different damping and different constraint conditions. Study the law of vibration, using the method of finite element analysis to analysis the vibration isolation, determine its feasibility and reliability, and its experimental verification.In order to improve the dynamic performance and the lower dead point of the repeated positioning accuracy, a kinematics and dynamics simulation also be given on mechanism using ADAMS simulation software in this thesis. And carry the parametric optimization analysis and design on mechanism. Analysis the bottom center precision variation caused by clearance and rod length changes on condition of no-load and blanking. And give a dynamic simulation on the measures that reduce the effect of inertia force. Proves the feasibility and correctness from the theory.Finally, use the bottom dead center dynamic tester test the bottom center precision on the high speed press. Identify the high-speed presses existing bottom center precision. Analysis the influence factor of bottom center precision according from the test results. Verify the correctness and reliability of the front analysis.Through the research analysis give high-speed press analysis and experiment about bottom dead center repeatability positioning accuracy using modern technology. Find out the influence factor of bottom center precision according. And put forward some improvement scheme and measures. For the improvement of dynamic performance of high-speed press, it has important practical value and significance to accelerate the development to high precision and high speed.